2. Educational program: Mechanic - electrician Title of program: Technical training II. class Oscillators Worked out: Bc. Chumchal Miroslav Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

3.  Description of oscillator function  RC and LC cell  Oscillator principle  Connection of LC oscillators– Colpitts  Connection of LC oscillators- Hartley  Students activities  Literature used

4. Oscillators are devices, which produce periodical variable courses of physical quantities. LC oscillators – they are intended to produce of vf. signals. After connection of current circuit became oscillating on resonant frequency. If elements would be ideal, than oscillations would have been undamped and oscillator would oscillated constantly. The real components are used the oscillator oscillating by damped oscillations. RC oscillators – uses for low frequency in interval from a few of Hz up to hundreds of KHz. These oscillators are feedback, which is composed from RC cells. The frequency of oscillator is given by frequency at which is phase shift of RC members is 0 0 or 180 0.

9. Explain function of RC and LC oscillators. How we can calculate f 0 at LC oscillator?

10. Build up a simple RC oscillator on contact field. Calculate his frequency according to components value. Calculated value compare with measured value.

11.  Vlastní poznámkový sešit  www.wikipedia.org./wiki/RC,LC článek www.wikipedia.org./wiki/RC,LC